jaoobt



(No Model.) 3 SheetsSheet 1.

0. M. JAGOBY.

CHAIR ROCKER. No. 406,400. Patented July 2, 1889 WINZASZK I ZWINI'OR i'f q. PETERS..PMl0-Lhho mpher. Washinghm. I164 (No Model.) 3 Sheets-Sheet2. G. M. JAGOBY.

CHAIR ROGKER No. 406,400. Patented July 2, 1889 0 ivmwzwa 0a., GM

(No Model.) 3 Sheets-Sheet 3 0. M.'JAO0BY.

- CHAIR ROCKER. No. 406,400. Patented July 2, 1889,

wxwafl gum un uuugu m UNITED STATES PATENT OFFICE.

CORNELIA M. .IAOOBY, OF ST. LOUIS, MISSOURI, ASSIGNOR OF TWO-TI-IIRDS TOFRANK TOMBRIDGE AND JULIUS J. SAITZ, BOTH OF SAME PLACE.

CHAIR-ROCKER.

SPECIFICATION forming part of Letters Patent No. 406,400, dated July 2,1889.

Application filed February 7, 1889. Serial No. 298,950. (No model.)

To all whom it may concern.-

Be it known that I, CORNELIA M. J ACOBY, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have inventedcertain new and useful Improvements in Chair-Rockers, of which thefollowing is a full, clear, and exact description.

My invention relates to improvements in that class of chair-rockerswhich are provided with adjustable clamping devices, whereby the rockerscan be removably attached to ordinary chairs of different sizes, and hasfor its object to insure a positive and direct hold on the legs of thechair and obviate the projection or unsightly appearance of any part ofthe clamping devices on the outside of the rockers.

My invention consists in the features of novelty hereinafter describedand claimed.

On the accompanying drawings, Figure 1 represents an inside elevation ofarockerconstructed and applied to the legs of an ordinary chair, brokenaway, according to my invention; and Fig. 2, a plan thereof; Fig. 3, a

2 5 detached inside view of rear portion of rocker, broken away, withclamping device attached thereto, as seen to the right of Fig. 1; Fig.4, a sectional plan thereof on line 1 1 in Fig. 3; and Figs. 5 and 6transverse sections on lines 2 2 and 3 3, respectively, in Fig. 3.

Like letters of reference denote like parts in all the figures.

a represents the rocker, to the inside face of which near its front endis secured by screws 3 5 b a rectangular or other suitably-shaped box orcasting 0, having its top and front side open and its ends d d and back6 closed.

To the inner upright (or inclined) face of the end d is fixed a coveringor cushion f, of

c rubber or other yielding material having preferably a concave facetransversely, while through the end d works longitudinally a screw-boltg, on the end of which within the box 0 is swiveledcentrally a clamp it,having a cushion 1', corresponding with and facing the cushion f.

At a suitable distance rearward from the box a is arranged along theinside face of the rocker a a second box or casting a, which is providedwith a cushion f, screw-bolt g,

clamp h, and cushion 1', similar in construction and arrangement to thecorresponding parts of the box 0. On the back 6' of the box 0' isformedor attached longitudinally with the box 0 adovetail projection j,which is inserted endwise (by means of a clearing-hole it) into acorresponding dovetail groove or slot 70, formed longitudinally in theinside face of and partially through the rocker a, so that the box 0will be thereby held trans-.60 versely to and at the same time capableof longitudinal movement or adjustment along the inside face of therocker a to the extent allowed by the length of the slot 10.

The lower part of the front leg m of the chair being inserted within thebox 0 against the front cushion f, the box 0 is moved or adjusted alongthe inside face of the rocker a until in the proper position forreceiving the rear leg n, which is then placed in the box 0 and theclamps h h moved inward by turning their respective screws 9 g until thelegs m n of the chair are thereby tightly clamped between the cushions ft' and f 1'', respectively, whereby the rocker a is firmly secured tothe chair.

The advantages of this invention are that the clamps h h being swiveledcentrally to the bolts g g and in directline with the chairlegs, themaximum clamping pressure is 01)- 8o tained and distributed uniformly onthe chairlegs, thereby insuring a more positive hold of the rockerthereto and lessening the danger of the rocker becoming loose ordetached; and, furthermore, as the hole It and groove is, 8 forreceiving the box 0, are only formed partially through the rocker a,there is no projection or view of any part of the device on the outsideof the rocker.

For rotating the screw-bolts g g, I may use .a detachable key orspanner, which is placed on the external square-shaped end of the bolts.

I claim,as my invention 1. In a chair-rocker, the combination of rockera, provided with a beveled groove is, 5 box or casting c, constructedsubstantially as described, and having a dovetail projection j, which isinserted within a corresponding groove or slot 70, formed along therocker a, with a screw-bolt g ,working through one end of box 0' andcarrying a clamp h, substantially as shown, and for the purposedescribed.

2. In a chair-rocker, the combination of a rocker a, provided with abeveled groove 70, a box or casting 0, having dovetail projection jinserted within groove 7c, of rocker a, one end of said box 0 having a.rubber or other cushion f, clamp h, provided with rubber cushion z",and a screw-bolt g, swiveled centrally to clamp h, substantially asshown, and 10 lor the purpose described.

In testimony whereof I affix my signature, in presence of two Witnesses,this 2d day of February, 1889.

OORNELIA M. JACOBY. \Vitnesses:

S. L. SCHRADER, W. M. BYRNE.

